650W enough to power future system?

I wanted to know if the psu can handle SLI 2 x MSI 560 Ti's also be able to handle the i5 3570K. I plan to OC the i5 a bit nothing too extreme using a Hyper 212+ so figure float around the 4.0-4.5Ghz level. Is this okay for it? I know not to skimp on the psu but figure since the Ivy Bridge is supposed to be lower wattage don't know if it will be much of a game changer for the PSU. 77W versus 95W less stress on the system figure with mild OC it would bring it up to 95-105W if using the Ivy bridge. Anyways thanks for the future input much appreciation for anyone's opinion!